[ 16.322887] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.913452] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.360500] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.195731] random: sshd: uninitialized urandom read (32 bytes read, 94 bits of entropy available) [ 22.374286] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts. [ 27.783510] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) executing program [ 27.884734] kasan: CONFIG_KASAN_INLINE enabled [ 27.889163] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.902573] Dumping ftrace buffer: [ 27.906092] (ftrace buffer empty) [ 27.909778] Modules linked in: [ 27.913080] CPU: 1 PID: 3312 Comm: syzkaller366084 Not tainted 4.4.112-gd96d95d #31 [ 27.920845] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.930180] task: ffff8801d11cc740 task.stack: ffff8800b45a8000 [ 27.936380] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.944624] RSP: 0018:ffff8800b45af9f0 EFLAGS: 00010a07 [ 27.950049] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825ba47b [ 27.957291] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.964535] RBP: ffff8800b45afa00 R08: 0000000000000001 R09: 0000000000000000 [ 27.971778] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.979019] R13: 0000000000000020 R14: ffff8801d0418000 R15: dffffc0000000000 [ 27.986261] FS: 00000000015ed880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.994457] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.000310] CR2: 0000000020ef0fe0 CR3: 00000001d1bd2000 CR4: 0000000000160670 [ 28.007555] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.014802] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.022041] Stack: [ 28.024162] 0000000000000000 ffff8801d0418158 ffff8800b45afa60 ffffffff825ba4a1 [ 28.032141] ffff8801d0418170 ffffed003a08302b ffffed003a08302e ffff8801d0418168 [ 28.040115] dead4ead00000000 ffff8801d0418140 0000000000000000 0000000000000000 [ 28.048082] Call Trace: [ 28.050642] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.057104] [] sg_finish_rem_req+0x2b5/0x340 [ 28.063131] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.069254] [] ? sg_get_rq_mark+0x142/0x190 [ 28.075195] [] sg_read+0x8c2/0x1490 [ 28.080450] [] ? __check_object_size+0x154/0x35b [ 28.086827] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.093473] [] ? fsnotify+0xee0/0xee0 [ 28.098897] [] ? avc_policy_seqno+0x9/0x20 [ 28.104755] [] do_loop_readv_writev+0x141/0x1e0 [ 28.111042] [] ? security_file_permission+0x89/0x1e0 [ 28.117767] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.124403] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.131047] [] do_readv_writev+0x5dd/0x6e0 [ 28.136901] [] ? vfs_write+0x530/0x530 [ 28.142414] [] ? handle_mm_fault+0xbf5/0x3190 [ 28.148534] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.154480] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.160598] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.167416] [] ? __fsnotify_parent+0xbc/0x340 [ 28.173534] [] ? avc_policy_seqno+0x9/0x20 [ 28.179412] [] vfs_readv+0x78/0xb0 [ 28.184572] [] SyS_readv+0xd9/0x240 [ 28.189820] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.196370] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.202919] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.209463] Code: 26 a6 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 28.236060] RIP [] __free_pages+0x21/0x90 [ 28.241950] RSP [ 28.246347] ---[ end trace e6c4cf0880caef0e ]--- [ 28.251145] Kernel panic - not syncing: Fatal exception [ 28.256938] Dumping ftrace buffer: [ 28.260455] (ftrace buffer empty) [ 28.264137] Kernel Offset: disabled [ 28.267732] Rebooting in 86400 seconds..